CVE-2021-3493

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
17/04/2021
Last modified:
19/02/2025

Description

The overlayfs implementation in the linux kernel did not properly validate with respect to user namespaces the setting of file capabilities on files in an underlying file system. Due to the combination of unprivileged user namespaces along with a patch carried in the Ubuntu kernel to allow unprivileged overlay mounts, an attacker could use this to gain elevated privileges.

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:lts:*:*:* 18.04 (excluding)
cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:lts:*:*:* 18.04.1 (including) 20.04 (excluding)
cpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:-:*:*:* 20.10 (excluding)